UCC28720
- < 10-mW No-Load Power
- Primary-Side Regulation (PSR) Eliminates Opto-
Coupler - ±5% Voltage and Current Regulation Across Line
and Load - 700-V Start-Up Switch
- 80-kHz Maximum Switching Frequency Enables
High-Power Density Charger Designs - Quasi-Resonant Valley-Switching Operation for
Highest Overall Efficiency - Wide VDD Range Allows Small Bias Capacitor
- Dynamic BJT Drive
- Overvoltage, Low-Line, and Overcurrent
Protection Functions - Programmable Cable Compensation
- SOIC-7 Package
The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) | PDF | HTML | 2015. 9. 30 | |
| 애플리케이션 노트 | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021. 8. 31 | ||
| 애플리케이션 노트 | Minimize Standby Consumption for UCC287XX Family | 2019. 8. 1 | |||
| 애플리케이션 노트 | Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 | 2017. 12. 6 | |||
| 애플리케이션 노트 | Troubleshooting TI PSR controllers | 2016. 10. 3 | |||
| 기술 문서 | Slim down your flyback; lose that excess snubber | PDF | HTML | 2016. 2. 15 | ||
| 백서 | Control Challenges for Low Power AC/DC Converters | 2015. 10. 2 | |||
| 백서 | Control Challenges for Low Power AC/DC Converters (PPT) | 2015. 10. 2 | |||
| 기술 문서 | Designing multiple output converters with primary side sensing | PDF | HTML | 2015. 8. 4 | ||
| 애플리케이션 노트 | 5-W USB Flyback Design Example Using the UCC28722 | 2014. 1. 8 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
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This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output. The power supply is set up to be constant voltage-constant current. The voltage and current are set by fixed resistor values and could (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| SOIC (D) | 7 | Ultra Librarian |
주문 및 품질
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.